package dao.impl;

import dao.UserDao;
import pojo.User;
import service.UserService;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;

public class UserDaoImpl implements UserDao {
    @Override
    public List<User> findAll() {
        List<User> list = new ArrayList<>();

        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;

        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            String URL = "jdbc:mysql://127.0.0.1:3306/jdbc?characterEncoding=utf-8";
            connection = DriverManager.getConnection(URL, "root", "123456");

           /* if (connection != null){
                System.out.println("连接成功");
            }
            String sql = "select * from sys_user";
            */
            String sql="SELECT * FROM user";

            preparedStatement = connection.prepareStatement(sql);

            resultSet = preparedStatement.executeQuery();

            while (resultSet.next()){
                User u = new User();
                u.setId(resultSet.getInt("id"));
                u.setName(resultSet.getString("name"));
                u.setPass(resultSet.getString("pass"));
                list.add(u);
            }
            return list;

        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        }  catch (SQLException e) {
            throw new RuntimeException(e);
        }finally {
            try {
                if (resultSet != null) {
                    resultSet.close();
                }
                if (preparedStatement != null) {
                    preparedStatement.close();
                }
                if (connection != null) {
                    ((Connection) connection).close();
                }
            } catch (SQLException e){
                {
                    throw new RuntimeException(e);
                }